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New methods:
- update_reader
- update_mmap
- update_mmap_rayon
These are more discoverable, more convenient, and safer.
There are two problems I want to avoid by taking a `Path` instead of a
`File`. First, exposing `Mmap` objects to the caller is fundamentally
unsafe, and making `maybe_mmap_file` private avoids that issue. Second,
taking a `File` raises questions about whether memory mapped reads
should behave like regular file reads. (Should they respect the current
seek position? Should they update the seek position?) Taking a `Path`
from the caller and opening the `File` internally avoids these
questions.
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